I thought Demon Hunter looked like a class I wouldn't usually play. I am all about the Barbarians, but I really enjoyed Monk during the Beta. So those are my 2 obvious choices. I am a man who enjoys brute strength (lol gender roles) Alas, I have instead chosen to challenge myself, and hopefully this will lead to a more fulfilling initial game experience. I'd love to take my Demon Hunter to level 60.
I also want to try finding rare and amazing items (for other classes, of course) and put them up for sale -- for real money -- on the auction house. I have no intention of buying anything. But if there's someone out there who will give me money for an in-game item... then great.
As for the class itself, it seems to shoot things and throw grenades. Like I said, for this kind of game, I'm really more of a warrior. Skyrim revolutionized my view on RPGs by allowing me to quickly shot fire and stab at the same time, etc. So I am hoping for the same kind of new gaming revelation that will open me up to new styles of play.